MEDLINE clinical queries are robust when searching in recent publishing years
Journal of the American Medical Informatics Association (2013) - Comments
pubmed: 23019242  doi: 10.1136/amiajnl-2012-001075  issn: 1527-974x  issn: 1067-5027 

Nancy L Wilczynski, K Ann McKibbon, Stephen D Walter, Amit X Garg, R Brian Haynes